Williams, 32, has spent his season between the Houston Astros and Rangers. Combined, he’s appeared in 28 games and has a 6.71 ERA. In his two starts, both with Texas, he’s 1-1 with a 9.90 ERA.

To make room for Williams on the 25-man roster, Sean O’Sullivan was designated for assignment. Tuesday's starter against the Los Angeles Angels is now to be determined since O'Sullivan was slated to get the nod.